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North-Central - 52nd Annual Meeting

Paper No. 1-1
Presentation Time: 8:00 AM

STALAGMITE RECORDS FROM WEST-CENTRAL PORTUGAL TEST LINKS BETWEEN NORTH ATLANTIC PALEOCEANOGRAPHY AND IBERIAN CONTINENTAL CLIMATE OVER THE PAST TWO GLACIAL CYCLES


DENNISTON, Rhawn F., Department of Geology, Cornell College, Mount Vernon, IA 52314, HOUTS, Amanda N., The Department of Earth Sciences, The University of New Hampshire, Durham, NH 03824, ASMEROM, Yemane, Earth & Planetary Sciences, University of New Mexico, 200 Yale Blvd., Northrop Hall, Albuquerque, NM 87131, WANAMAKER Jr., Alan D., Department of Geological and Atmospheric Sciences, Iowa State University, 12 Science I, Ames, IA 50011-3212, HAWS, Jonathan A., Anthropology, University of Louisville, Louisville, KY 40292, POLYAK, Victor J., Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, NM 87131, THATCHER, Diana L., Department of Geological and Atmospheric Sciences, Iowa State University, 253 Science I, Ames, IA 50011, ALTAN-OCHIR, Setsen, Geology, Cornell College, 810 Commons Cir SW1280, Mount Vernon, IA 52314-1000, BOROWSKE, Alyssa, University of Connecticut, Stoors, CA, BREITENBACH, Sebastian, Department of Sediment and Isotope Geology, Ruhr University Bochum, Bochum, Germany, UMMENHOFER, Caroline, Woods Hole Oceanographic Institution, Falmouth, MA 02543, REGALA, Francisco, Associação de Estudos Subterrâneos e Defesa do Ambiente, Torres Vedras, Portugal, BENEDETTI, Michael M., Earth and Ocean Sciences, University of North Carolina Wilmington, 601 S. College Rd, Wilmington, NC 28403 and BICHO, Nuno, ICArEHB, Universidade do Algarve, Faro, 8005, Portugal

Links between Iberian hydroclimate and North Atlantic sea surface temperature (SST) have been carefully examined across the past several glacial cycles using marine sediment and pollen grains co-deposited on the Portuguese continental margin. Few directly dated, independent continental records of Iberian climate spanning similar time intervals have been identified, however. We present a high-resolution, multi-proxy (isotopic ratios of carbon, oxygen, and uranium, as well as growth intervals) record of hydroclimate from several stalagmites obtained from two caves (Buraca Gloriosa and Gruta do Casal da Lebre) in west-central Portugal that span the majority of the last two glacial cycles (~230 ka). At orbital and millennial scales, stalagmite-based proxies of hydroclimate covaried with SST, with positive carbon isotope excursions and/or growth hiatuses indicating reduced effective moisture coincident with colder conditions with ice-rafted debris events and Greenland stadials. These findings agree well with reconstructions of continental climate derived from pollen extracted from Iberian margin marine sediments. However, the Portuguese stalagmite record also reveals intervals during which the magnitudes of hydroclimate changes may have been somewhat decoupled from SST.

Session No. 1

T3. Climate Reconstructions from Cave Deposits
Monday, 16 April 2018: 8:00 AM-12:00 PM
Benton Auditorium (Scheman Building )
Geological Society of America Abstracts with Programs. Vol. 50, No. 4
doi: 10.1130/abs/2018NC-311401
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